三维模型相互转换(obj文件转inp文件)

news2024/9/22 5:30:19

三维模型文件根据其含义都是可以进行相互转换的,这里主要介绍obj文件转化为inp文件。

什么是inp文件?

inp文件是以.inp后缀的文本文件,它包括了模型的全部数据信息,ABAQUS求解器分析的对象是inp文件,软件生成的.cae文件只是为了inp文件服务

如果能够熟练掌握inp文件的语法以及用法,直接在文件中进行修改,或者在软件中修改关键词,要比在软件中修改的效率高很多,不仅如此还可以完成软件内所不支持的功能。如在inp文件内定义输出。

为方便起见,建议先在软件建模,然后在文本编辑器中手动修改INP文件。

inp文件结构

每个完整的INP文件依次出现两部分数据:模型数据历程数据

  • 模型数据包括节点信息、单元信息、截面属性、材料特性、材料选项、其他模型信息
  • 历程数据包括静力分析(分析步参数等)、载荷和边界条件、结果输出
    • *STEP是历程数据和模型数据的分界点,第一个*STEP之前的所有内容均属于模型数据,其后的所有内容则属于历程数据。
    • 注:书写INP文件时模型数据必须在历程数据之前

后面就不再赘述了,具体可以看这个连接,写的比我写得好:

ABAQUS的inp文件解读

obj文件格式

3D模型的格式包括 .obj, .3ds, .ply, .mesh,其中obj文件最为简单。obj文件开头是一系列的特征标签,提示存储的是什么样的数据,然后是三维空间坐标、纹理坐标、法向量等其他信息。

常用的obj标签有:顶点几何信息,纹理坐标,顶点法向量,三角面等信息。其他的标签包括,对象名字、所用材料、曲率和阴影等。在obj文件用txt文件打开,头几行**“#“**是注释,编译器忽略注释的这几行;

,obj文件的名字,编译器也需要忽略;

,说明这些面不该被平滑,编译器也会忽略该行;

,表示四面体的5个点的相对于原点(0,0,0)的X,Y,Z坐标,原点在模型的中心;

vt,代表纹理坐标,数量比顶点数量多,因为一个顶点可能参与多个三角形,在不同三角形中有不同的纹理坐标;

vn,表示不同的法向量,法向量的行数通常比顶点的行数多,是因为有一些顶点同时在不同三角形中;

,表示三角形,每个面有三个元素,是用/分隔。

2文件解析

假设用Blender软件建立一个五面体金字塔,然后选择.obj格式导出文件包括纹理坐标和顶点法向量。

以txt格式打开obj文件

以金字塔第三个面为例,也就是紫色第三行:

�2/7/35/8/33/9/3

第一个数:2 5 3 是 v 顶点坐标id三角形;

第二个数:7 8 9 是 vt 纹理坐标id三角形;

第三个数:3 3 3 是 vn 法向量id,三个点组成的面有一样的法向量,因此有一样的法向量id;

f 2 5 3     只有顶点ID,不包括纹理坐标和法向量

f 2/7 5/8 3/9  有纹理坐标,没有法向量

f 2//3 5//3 3//3 没有纹理坐标,有法向量

可以根据标签 v、vt、vn、f 写出obj文件,这在模型融合时很有用。

3obj文件的特点

① 只支持三角形的模型,顶点位置、纹理坐标和法向量必须说明,形如: f #/#/# #/#/# #/#/#;

② 当材料标签被忽略时,纹理贴图须用顶点坐标对应的方法完成;

③ 只支持全三角形网格模型;

④ 每一行的元素由空格分隔开。

具体连接可以看这个,写的 very good:obj文件格式 - 知乎

我这里做的事将obj文件转化为inp文件

首先需要去转化节点,参考下面的obj文件

####
#
# OBJ File Generated by Meshlab
#
####
# Object 123.obj
#
# Vertices: 324
# Faces: 108
#
####
mtllib ./123.obj.mtl

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# 324 vertices, 0 vertices normals


usemtl material_0
f 1//1 2//2 3//3
f 4//4 5//5 6//6
f 7//7 8//8 9//9
f 10//10 11//11 12//12
f 13//13 14//14 15//15
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# End of File
 

v代表节点 ,vn,表示不同的法向量vt,代表纹理坐标

因此我们转化的时候只需要将v进行转换 为inp node节点

,表示三角形转化为 单元信息

*ELEMENT, TYPE=CAX3  表示三个节点  因为obj网格都是三角形 所以采用 这个类型参数

*ELEMENT, TYPE=CAX4 表示四个节点  正方形网格

inp文件如下所示

*Heading
**
*Preprint, echo=NO, model=NO, history=NO, contact=NO
**
*Part, name=Part-1
*NODE
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2, 100, 0, 100
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225, 96.1232, 23.6922, 0
226, 92.5666, 35.1059, 100
227, 96.1232, 23.6922, 0
228, 96.1232, 23.6922, 100
229, 96.1232, 23.6922, 100
230, 96.1232, 23.6922, 0
231, 98.2782, 11.9331, 0
232, 96.1232, 23.6922, 100
233, 98.2782, 11.9331, 0
234, 98.2782, 11.9331, 100
235, 98.2782, 11.9331, 100
236, 98.2782, 11.9331, 0
237, 99, 0, 0
238, 98.2782, 11.9331, 100
239, 99, 0, 0
240, 99, 0, 100
241, 0, 99, 0
242, 0, 99, 100
243, 0, 100, 0
244, 0, 100, 0
245, 0, 99, 100
246, 0, 100, 100
247, 0, 100, 0
248, 0, 100, 100
249, 12.0537, 99.2709, 0
250, 12.0537, 99.2709, 0
251, 0, 100, 100
252, 12.0537, 99.2709, 100
253, 12.0537, 99.2709, 0
254, 12.0537, 99.2709, 100
255, 23.9316, 97.0942, 0
256, 23.9316, 97.0942, 0
257, 12.0537, 99.2709, 100
258, 23.9316, 97.0942, 100
259, 23.9316, 97.0942, 0
260, 23.9316, 97.0942, 100
261, 35.4605, 93.5016, 0
262, 35.4605, 93.5016, 0
263, 23.9316, 97.0942, 100
264, 35.4605, 93.5016, 100
265, 35.4605, 93.5016, 0
266, 35.4605, 93.5016, 100
267, 46.4723, 88.5456, 0
268, 46.4723, 88.5456, 0
269, 35.4605, 93.5016, 100
270, 46.4723, 88.5456, 100
271, 46.4723, 88.5456, 0
272, 46.4723, 88.5456, 100
273, 56.8065, 82.2984, 0
274, 56.8065, 82.2984, 0
275, 46.4723, 88.5456, 100
276, 56.8065, 82.2984, 100
277, 56.8065, 82.2984, 0
278, 56.8065, 82.2984, 100
279, 66.3123, 74.8511, 0
280, 66.3123, 74.8511, 0
281, 56.8065, 82.2984, 100
282, 66.3123, 74.8511, 100
283, 66.3123, 74.8511, 0
284, 66.3123, 74.8511, 100
285, 74.8511, 66.3123, 0
286, 74.8511, 66.3123, 0
287, 66.3123, 74.8511, 100
288, 74.8511, 66.3123, 100
289, 74.8511, 66.3123, 0
290, 74.8511, 66.3123, 100
291, 82.2984, 56.8065, 0
292, 82.2984, 56.8065, 0
293, 74.8511, 66.3123, 100
294, 82.2984, 56.8065, 100
295, 82.2984, 56.8065, 0
296, 82.2984, 56.8065, 100
297, 88.5456, 46.4723, 0
298, 88.5456, 46.4723, 0
299, 82.2984, 56.8065, 100
300, 88.5456, 46.4723, 100
301, 88.5456, 46.4723, 0
302, 88.5456, 46.4723, 100
303, 93.5016, 35.4605, 0
304, 93.5016, 35.4605, 0
305, 88.5456, 46.4723, 100
306, 93.5016, 35.4605, 100
307, 93.5016, 35.4605, 0
308, 93.5016, 35.4605, 100
309, 97.0942, 23.9316, 0
310, 97.0942, 23.9316, 0
311, 93.5016, 35.4605, 100
312, 97.0942, 23.9316, 100
313, 97.0942, 23.9316, 0
314, 97.0942, 23.9316, 100
315, 99.2709, 12.0537, 0
316, 99.2709, 12.0537, 0
317, 97.0942, 23.9316, 100
318, 99.2709, 12.0537, 100
319, 99.2709, 12.0537, 0
320, 99.2709, 12.0537, 100
321, 100, 0, 0
322, 100, 0, 0
323, 99.2709, 12.0537, 100
324, 100, 0, 100
*ELEMENT, TYPE=CAX3
1, 1, 2, 3
2, 4, 5, 6
3, 7, 8, 9
4, 10, 11, 12
5, 13, 14, 15
6, 16, 17, 18
7, 19, 20, 21
8, 22, 23, 24
9, 25, 26, 27
10, 28, 29, 30
11, 31, 32, 33
12, 34, 35, 36
13, 37, 38, 39
14, 40, 41, 42
15, 43, 44, 45
16, 46, 47, 48
17, 49, 50, 51
18, 52, 53, 54
19, 55, 56, 57
20, 58, 59, 60
21, 61, 62, 63
22, 64, 65, 66
23, 67, 68, 69
24, 70, 71, 72
25, 73, 74, 75
26, 76, 77, 78
27, 79, 80, 81
28, 82, 83, 84
29, 85, 86, 87
30, 88, 89, 90
31, 91, 92, 93
32, 94, 95, 96
33, 97, 98, 99
34, 100, 101, 102
35, 103, 104, 105
36, 106, 107, 108
37, 109, 110, 111
38, 112, 113, 114
39, 115, 116, 117
40, 118, 119, 120
41, 121, 122, 123
42, 124, 125, 126
43, 127, 128, 129
44, 130, 131, 132
45, 133, 134, 135
46, 136, 137, 138
47, 139, 140, 141
48, 142, 143, 144
49, 145, 146, 147
50, 148, 149, 150
51, 151, 152, 153
52, 154, 155, 156
53, 157, 158, 159
54, 160, 161, 162
55, 163, 164, 165
56, 166, 167, 168
57, 169, 170, 171
58, 172, 173, 174
59, 175, 176, 177
60, 178, 179, 180
61, 181, 182, 183
62, 184, 185, 186
63, 187, 188, 189
64, 190, 191, 192
65, 193, 194, 195
66, 196, 197, 198
67, 199, 200, 201
68, 202, 203, 204
69, 205, 206, 207
70, 208, 209, 210
71, 211, 212, 213
72, 214, 215, 216
73, 217, 218, 219
74, 220, 221, 222
75, 223, 224, 225
76, 226, 227, 228
77, 229, 230, 231
78, 232, 233, 234
79, 235, 236, 237
80, 238, 239, 240
81, 241, 242, 243
82, 244, 245, 246
83, 247, 248, 249
84, 250, 251, 252
85, 253, 254, 255
86, 256, 257, 258
87, 259, 260, 261
88, 262, 263, 264
89, 265, 266, 267
90, 268, 269, 270
91, 271, 272, 273
92, 274, 275, 276
93, 277, 278, 279
94, 280, 281, 282
95, 283, 284, 285
96, 286, 287, 288
97, 289, 290, 291
98, 292, 293, 294
99, 295, 296, 297
100, 298, 299, 300
101, 301, 302, 303
102, 304, 305, 306
103, 307, 308, 309
104, 310, 311, 312
105, 313, 314, 315
106, 316, 317, 318
107, 319, 320, 321
108, 322, 323, 324
*End Part

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